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Finding the Fourth Proportional to 660.61, 910.89 and 494.29

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Solution

The fourth proportional to 660.61, 910.89 and 494.29 is: 681.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.61 : 910.89 = 494.29 : x
  2. Step 2: Convert to fraction form
    660.61/910.89 = 494.29/x
  3. Step 3: Cross multiply
    660.61x = 910.89 × 494.29
  4. Step 4: Simplify right side
    660.61x = 450,236.79
  5. Step 5: Solve for x
    x = 450,236.79/660.61
  6. Step 6: Final answer
    x = 681.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.